TXP-C20_Instruction_Manual_(Rev1.0)
REV – 1.0
[34-2900-0207-5 ]
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relay, front panel LED, and optional discrete relay to latch.
NO
allows all outputs for this alarm to
automatically reset after the alarm condition clears.
Discrete LED indicators on the front panel indicate the status of each alarm. Any new alarm event causes the
associated LED to flash until an Alarm Reset occurs causing an acknowledged steady on condition. Operators should
recognize new alarms by a flashing LED. Alarm Reset also acknowledges, or deactivates, audible devices driven by
the AUDIBLE ALARM option connector J2 (see Figure 4-3)
3.3.4
Configure Menu to Define Channel
The channel setup menu after the alarm menus is CONFIGURE. It allows setting Name and EUNIT ASCII fields,
defining the measurement range, and how many decimal points of resolution the reading will have.
Figure 3-5 – Config Screen
3.3.4.1
Name / EUnits ASCII Data Fields
The first two items in this menu are for entering the 10-character channel Name and engineering unit ASCII fields.
Name should describe the channel’s data in user terminology such as tag # or other description. Eunits should
define the units of measure for what this channel is to display. Several standard Eunits fields are available by
pressing EDIT but if these are inappropriate, a CUSTOM field allows editing of each character. Section 2.2 describes
how to modify these fields using the keypad.
3.3.4.2
Input Measurement Range
The ZERO / SPAN menu entries allow configuration of the measurement range displayed by this channel.
Measurement Range defines the range of the input signal’s engineering units. For example, if a channel’s input is 4-
20mA from a transmitter monitoring 0 to 10ppm chlorine, then the
Zero
value should equal 0.000 and the
Span
value equal 10.00. Four digits must be entered so trailing 0’s may appear here that are not displayed on other data
screens.
3.3.4.3
Decimal Point Resolution
Resolution of the displayed channel value is configured in this menu by setting the number digits trailing the decimal
point. Displayed readings are limited to a maximum of four digits with a polarity sign. Auto-ranging displays the
highest resolution allowed by this menu’s decimal point entry. For example, a range of 0 to 100ppm and two
decimal points reads 0.00 at 0ppm and 100.0 at 100ppm. This may be undesirable due to the high resolution at zero
unless the sensor’s output is extremely stable. If decimal points are limited to one, the 0ppm reading becomes 0.0
